| original |
Early Cambrian |
|
USSR |
Naumova,S.N. Zonal assemblages of Precambrian and Lower Cambrian plant microfossils of Eurasia and their stratigraphic importance. |
1968 |
| details |
Late Precambrian |
|
USSR(Buryat ASSR) |
Kuznetzov,K.N. et al. New data on the stratigraphy of Late Precambrian of the Kurtun River Basin, (southwestern Pri-Baikal). (In: Material on the Biostratigraphy and Paleogeography of Eastern Siberia) |
1975 |
| details |
Early Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |